<template>
    <li>
        <label>
            <input type="checkbox" 
                :checked="todo.done" 
                @change="handleCheck(todo.id)"/>
            <!-- 如下代码也能实现功能，但是不推荐，因为修改了props，违反了props只读的原则 -->
            <!-- <input type="checkbox" :checked="todo.done" @change="handleCheck(todo.id)"/> -->
            <span>{{todo.title}}</span>
        </label>
        <button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
    </li>
</template>

<script>
export default {
    name:"Item",
    methods:{
        handleCheck(id){
            //通知app组件将对应的todo对象的值取反
            this.checkTodo(id);
        },
        handleDelete(id){
            if(confirm("确定删除吗")){
                this.deleteTodo(id);
            }
        }
    },
    //声明接受todo对象
    props:["todo","checkTodo","deleteTodo"]
}
</script>

<style scoped>
    /*item*/
    li {
        list-style: none;
        height: 36px;
        line-height: 36px;
        padding: 0 5px;
        border-bottom: 1px solid #ddd;
    }

    li label {
        float: left;
        cursor: pointer;
    }

    li label li input {
        vertical-align: middle;
        margin-right: 6px;
        position: relative;
        top: -1px;
    }

    li button {
        float: right;
        display: none;
        margin-top: 3px;
    }

    li:before {
        content: initial;
    }

    li:last-child {
        border-bottom: none;
    }

    li:hover{
        background-color: skyblue;
    }

    li:hover button{
        display: block;
    }
</style>